Effect of agitation pretreatment on anaerobic digestion of swine manure

This study evaluated the effect of mechanical agitation pretreatment on anaerobic digestion (AD) of swine manure (SM). The results showed a remarkable increase in soluble polysaccharides, soluble proteins, and soluble chemical oxygen demand (SCOD) by 82.42%, 121.17%, and 114.89%, respectively, after the SM being agitated for 22 h. No improvement in the volatile fatty acids (VFAs) yield was observed during the agitation pretreatment. Apparently, agitation significantly accelerated the hydrolysis of SM, while it did not seem to enhance the acidification step. Batch AD experiments showed an improved accumulative methane yield by 77.89% with the pretreated SM compared to raw SM.     

铜矿山二次资源开发利用研究与实践

针对铜矿山二次资源所具有的资源利用和生态整治的双重特点,研究提出了铜矿山二次资源开发利用协同矿区环境综合整治的技术解决方案。云南某铜矿山的工程化应用实践证明:在回收矿山二次资源的同时整治环境,既可为企业创造价值,寻求盈利与关爱环境和社区发展的平衡点,又可以取得良好经济效益、环境效益和社会效益。研究结果值得类似铜矿山借鉴。     

Development of testing procedure for ceramic disc filters

Small-scale laboratory tests for sizing and designing disc filters are typically performed by using leaf test equipment. Although the basic tests are fairly simple and quick, the accuracy and repeatability of the results may be poor due to various reasons. In addition to errors caused by variations in the structure of the equipment, also the skills and experience of the person performing the tests is of great importance. This paper introduces an experimental study carried out for defining the most important sources of errors in these kinds of laboratory tests and for estimating their influence on the final test results. The results obtained in this study were utilized for designing an improved version of the test equipment and also for creating a standard procedure for performing the tests. The results acquired with the small-scale laboratory tests were in good agreement with the performance results obtained from full-scale ceramic disc filters operating in industrial processes.     

新疆某铀矿石浸出试验

为了给新疆某铀矿采用地面堆浸和井下原地爆破堆浸的采矿新方法恢复生产提供依据，对该矿矿石进行了试验室搅拌浸出和柱浸试验。试验结果表明，该矿矿石氧化剂耗量少、浸出时间短、酸耗较低，属易浸矿石。矿石粒度对浸出率影响较大，当粒度从-5mm增加到-20mm时，矿石的柱浸渣计浸出率从88.7％下降到75．2％。氧化剂可提高浸出液铀浓度，但提高幅度不大。     

氧化锌酸性浸出搅拌槽的设计特点

论述了将人德国ＥＫＡＴＯ公司进口的搅拌机进行消化、吸收后，将进口搅拌机的先进技术以及在生产实践中对基优异斩改造经验，应用于氧化锌浸出搅拌槽的设计，通过生产检验，取得圆满成功。     

反应器结构对黄原胶发酵的影响

本文通过对黄原胶在不同结构的发酵罐上生产结果的研究，分析讨论了发酵罐的搅拌器、罐体高径比、桨叶直径与挡板、加热系统及通气量控制等因素对发酵的影响。认为加大高径比值，增加桨叶层数，减小桨叶直径，消除挡板的剪切影响，增大调温系统的传热面积并降低热源温度，控制合理的通气量等方式都是提高发酵产品产量与质量的有效途径。     

一种自吸气搅拌装置的研制与设计

该搅拌装置采用自吸气方式,吸气量大,氧气利用率高,反应速度快.特别适用于需要氧化与化合两个反应一次完成的情况,如用铜粉直接加在稀硫酸溶液中,通过此装置,可快速制得硫酸铜溶液.     

应用热膜风速仪测定搅拌槽内气—液两相流的流体力学参数

开发应用了恒温热膜风速仪（简称ＣＴＡ）来测定搅拌槽内气－液两相流的局部气含率、液体的时均速度及脉动速度的均方根值。根据柱形热膜探头以及气－液搅拌槽内流体流动特性，改进了用电压概率密度法＾［１］划分气－液搅拌槽内气液两相信号的方法，在此基础上得到了局部气含率、液体的时均速度及脉动脉动速度均方根值的计算公式。研究了热膜探头偏角及流体介质温度变化对热膜风速仪测量精度的影响，并对流体介质温度的影响进行了校     

THE EFFECT OF PRECIPITATION PARAMETERS ON PREPARATION OF LITHIUM FLUORIDE (LIF) NANO-POWDER

Lithium fluoride powder (LiF) is a white powder with a density of 2.64 gr/cm³ and a melting point of 848°C. This powder has several applications such as flux, glaze, soldering, and aluminum melting process, but one of the most important uses of this powder is its application in dosimetry. The commercial powders currently used for this purpose have average sizes of 5 to 10 micrometers; the objective of this research is to produce LiF powder with nano-metric particle size. In this study, the reaction of LiOH + HF → LiF + H₂O has been selected from among several reactions that were able to produce LiF powder, and some precipitation parameters such as temperature, time, agitation type, and supersaturation degree have been controlled. The morphology, phase analysis, and particle size distribution of the resulting powders were analyzed by SEM, XRD, and LPSA. Finally, lithium fluoride nano-powder was synthesized at a temperature of 25°C, pH about 2-3, reaction time less than 1 s, and agitation by ultrasonic bath.